Yurii K.

Full-Stack Developer (5 years) — TypeScript • Node.js • React/Next.js • .NET (C#) I’m a full-stack developer with 5 years of commercial experience building web applications, APIs, and end-to-end product features. My primary stack is JavaScript/TypeScript with Node.js, React, and Next.js, and I also bring strong backend experience with C#, .NET, and ASP.NET Core—so I can work comfortably across the entire system. What I can help with Building and scaling React/Next.js apps (SSR/SSG, routing, auth, dashboards) Designing and implementing REST APIs (Node/Express/Nest or ASP.NET Core) Database work: schema design, migrations, query optimization Integrations: payment providers, third-party APIs, webhooks Performance & reliability: caching, background jobs, error handling, logging Quality: TypeScript-first code, tests, code reviews, clean architecture Fixing and modernizing existing codebases (refactors, upgrades, tech debt) Tech stack TypeScript, JavaScript, Node.js, React, Next.js, Express/NestJS, C#, .NET, ASP.NET Core, PostgreSQL/MySQL, MongoDB, Redis, Docker, Git, CI/CD (GitHub Actions/GitLab CI), Jest/RTL, Playwright/Cypress. How I work I start by clarifying goals and constraints, then deliver in small, reviewable increments with clear status updates. You’ll get maintainable code, predictable progress, and a smooth handoff with documentation. If you share your brief or repo, I’ll reply with a short plan—quick wins, timeline, and the best approach for your next release.